This vine with the striking blue-violet flower clusters is Wisteria. You see it here at the entrance to Clegg Garden. Obviously it was planted here years ago. I don't know what species of Wisteria it is, it could be one of the non-native species, although there is a native species of Wisteria, Wisteria frutescens.
Photo taken April 26, 2016.
Link to Wisteria:
Link to reported range of Wisteria species in North America:
